linux-kernel - [PATCH] gpio: ml-ioh: Add devm_free

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Date:   Thu, 12 May 2022 19:21:06 +0800
From:   Zheyu Ma <zheyuma97@...il.com>
To:     andy@...nel.org, linus.walleij@...aro.org, brgl@...ev.pl
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Zheyu Ma <zheyuma97@...il.com>
Subject: [PATCH] gpio: ml-ioh: Add devm_free_irq() call to remove flow

When removing the module, we will get the following flaw:

[   14.204955] remove_proc_entry: removing non-empty directory 'irq/21', leaking at least 'gpio_ml_ioh'
[   14.205827] WARNING: CPU: 0 PID: 305 at fs/proc/generic.c:717 remove_proc_entry+0x389/0x3f0
[   14.209994] RIP: 0010:remove_proc_entry+0x389/0x3f0
[   14.217820] Call Trace:
[   14.218057]  <TASK>
[   14.218264]  unregister_irq_proc+0x14c/0x170
[   14.218674]  irq_free_descs+0x94/0xe0
[   14.219019]  mp_unmap_irq+0xb6/0x100
[   14.219357]  acpi_unregister_gsi_ioapic+0x27/0x40
[   14.219796]  acpi_pci_irq_disable+0x1d3/0x320
[   14.220206]  pci_disable_device+0x1ad/0x380
[   14.220613]  ioh_gpio_remove+0xc5/0xe0 [gpio_ml_ioh]
[   14.221075]  pci_device_remove+0x92/0x240

Fix this bug by adding devm_free_irq() call to remove flow.

Signed-off-by: Zheyu Ma <zheyuma97@...il.com>
---
 drivers/gpio/gpio-ml-ioh.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpio/gpio-ml-ioh.c b/drivers/gpio/gpio-ml-ioh.c
index b060c4773698..09bf317876b0 100644
--- a/drivers/gpio/gpio-ml-ioh.c
+++ b/drivers/gpio/gpio-ml-ioh.c
@@ -508,6 +508,8 @@ static void ioh_gpio_remove(struct pci_dev *pdev)
 	struct ioh_gpio *chip = pci_get_drvdata(pdev);
 	void *chip_save;
 
+	devm_free_irq(&pdev->dev, pdev->irq, chip);
+
 	chip_save = chip;
 
 	for (i = 0; i < 8; i++, chip++)
-- 
2.25.1